The Sanders campaign alleged in an open letter to the Democratic National Committee that the Hillary Victory Fund -- which raises money for the Clinton campaign, the DNC and 32 state Democratic committees -- "skirts legal limits on federal campaign donations."

The Clinton campaign has hit back, calling Sanders' attacks "irresponsible" and "misleading," and describing their own fundraising with the DNC as above-board.

Judge Andrew Napolitano said on "Shepard Smith Reporting" that the Sanders campaign's claim seems "dubious," noting that if they had evidence of a violation, they surely would have presented it to the Federal Elections Commission.

"The FEC is probably saying, 'We're here, we're here! We exist to investigate these things. We'll be on it immediately if you send us a complaint.'"

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